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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013e621655dd3af3e835b45d4b42656866fe88d73a22c1892bdf0b8afdf20e99' 
  AND token = 'cS1qcFd0D8yRI0xdHU3hnU/vdyQ05Ozi9Dh1gYRMPD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}